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In Drupal\rsvplist\Form\RSVPForm->buildForm(), I wrote this to get the current nid:

$node = \Drupal::routeMatch()->getParameter('node');
$nid = $node->nid->value;

I get this error:

Notice: Trying to get property 'nid' of non-object in Drupal\rsvplist\Form\RSVPForm->buildForm() (line 30 of modules\custom\rsvplist\src\Form\RSVPForm.php).

I am a new module developer. How to get the current nid in drupal 8?

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4
  • What URL are you doing this? Is this form a separate standalone page? The get parameter node will work only on node view pages. Is your form going to be shown in a block under the node? in the node pages?
    – anoopjohn
    Nov 11, 2019 at 0:30
  • 2
    Use the id() method instead. You also have to check if $node is an instance of NodeInterface because you could be on a route where that won't work (like a user, view, taxonomy, or media route).
    – Kevin
    Nov 11, 2019 at 1:04
  • ->getRawParameter() will return just the NID as well
    – Prestosaurus
    Nov 11, 2019 at 1:14
  • 1
    But that could be any ID, couldn't it?
    – Kevin
    Nov 11, 2019 at 3:37

1 Answer 1

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5

You will need to check if the $node variable is actually an instance of node object.

if ($node instanceof \Drupal\node\NodeInterface) {
  // You can get nid and anything else you need from the node object.
  $nid = $node->id();
}

See

How do I get the current node ID?

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